Malicious PDF — malware analysis report

Static analysis result for SHA-256 971a45c457a512c0…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 09:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddb399d700e218971c5baf39fa444992 SHA-1: 5221fa669ec2ccbeb12229f7d755e1652e2f0078 SHA-256: 971a45c457a512c098d3ac3aece1195a8a7d4518edffc5e13a36dec18788be36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, with many distinct hosts, suggesting a coordinated effort to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of many links and the high risk score indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pribatu.lamilagrosaimport.com/images/files/kojirisinub.pdf In PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/nafofi.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/13188563502.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/biwegusu.pdfIn PDF document text
    • http://fruitvita.com/files/files/judizafironawod.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/solelixetekexop.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/2232923963.pdfIn PDF document text
    • http://tencanpowder.com/d/files/lozifof.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba7e01b5d---69778588916.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/boxenatepuzimopowow.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/65634729848.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/lirebisatumovadafag.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/54580439068.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/eb13962222f04bbe5086180d5cc3ec83/22564994961.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/voboviw.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109040507165497.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/56122378145.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/segew.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/87782853614.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/nesokinadesiputagoj.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/54553133077.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/47735554357.pdfIn PDF document text
    • https://istanajp2.com/contents/files/mirisusosugolawuwi.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210911221521.pdfIn PDF document text
    • http://wuchem.com/upload/files/doravedizugunapesilaf.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/49463798953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=super+tv+app+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 16344 bytes
SHA-256: 6dc7c87ba3e7d58acf9ebb81fe3f5ccad4bd04703993ec0d4d46588f1482065c
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 10412 bytes
SHA-256: 672e6c8db3df3290d58d56aab64e648273718b7e0d19a3f9ecaf05e35359f2d5